Extended Reach Well Patents: Top Companies & Filing Trends 2026
Extended Reach and Horizontal Well Patents: Who Holds the Ground
49.7% concentration. The top 5 assignees combined account for 296 of the 596 records in scope — near half the field sits with a handful of filers. Filings rose from 5 in 2017 to a peak of 13 in 2020, and after a dip climbed again to 13 in 2024 — a 30% increase over the 2021-2024 span. 2025 and 2026 figures are not yet comparable: publication typically lags filing by roughly 18 months, so the most recent two years understate actual filing activity rather than showing a real decline.
- 1HALLIBURTON ENERGY SERVICES INC122
- 2M I LLC(US)51
- 3LANDMARK GRAPHICS CORP51
- 4WESTERN WELL TOOL46
- 5TERCEL IP26
See the full extended reach and horizontal wells analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about extended reach well patents
Who holds the most patents in extended reach and horizontal well drilling?
One assignee leads the ranked list with 122 records, well ahead of the rest of the field, and the top 5 assignees together hold 296 of the 596 records in scope, or 49.7%. That level of concentration means a small number of oilfield service companies set the boundaries that most other filers have to work around. Beyond the top 10, which holds 64.1% of records, filing activity thins into a long tail of smaller and single-filing entrants.
What technology areas dominate extended reach well patent filings?
E21B, the earth and rock drilling classification, appears on 81.5% of the 596 records in scope, making mechanical drilling hardware and operational technique the dominant subject matter. C09K materials-science classifications, largely drilling fluids and additives, appear on 21.1% of records — a substantial but much smaller share. Geophysics, digital data processing and control-systems classes each appear on single-digit shares, indicating instrumentation and monitoring technology is a secondary but present theme.
Is patent filing activity in extended reach drilling growing or slowing?
Filings rose from 10 in 2021 to 13 in 2024, a 30% increase over that span, following an earlier peak of 13 in 2020. The apparent drop-off in 2025 and 2026 should not be read as a slowdown: patent publication typically lags actual filing by around 18 months, so the most recent one to two years in any dataset are still filling in. The reliable read on trend direction stops at 2024.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Extended Reach and Horizontal Wells covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.